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Natural Resources Canada |  |
 About the Industry |
About Canadian Ratings |
About Frames |
About Sealed Units |
About Installations |
Natural Resources Canada web site |
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Natural Resources Canada web site: Click below to view the Natural Resouces Canada handbook entitled: Consumers Guide to Buying Energy Efficient Windows and Doors http://oee.nrcan.gc.ca/publications/infosource/pub/renovate/Consumers_Guide_EE_Windows_Intro.cfm |